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Search Results: 1 - 10 of 118153 matches for " T. Mizuno "
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Heterogeneity and Colonial Governance  [PDF]
Nobuhiro Mizuno
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.52032
Abstract: Some existing studies argue that indirect colonial rule adversely affects postcolonial development. To analyze the situation under which a colonial power adopts indirect rule to govern a colony, we analyze a delegation model wherein the colonial power decides whether to delegate policy choice to an agent who has an information advantage but has different policy preferences from that of the colonial power. The colonial power decides whether to delegate policy choice in multiple districts, and can acquire information by paying a cost in each district. We show that colonial powers are prone to adopt indirect rule when the heterogeneity among districts is high. The results are a possible explanation for why colonial powers utilized indirect rule in Africa, a region with high levels of ethnic diversity.
Interchain interactions and magnetic properties of Li2CuO2
Y. Mizuno,T. Tohyama,S. Maekawa
Physics , 1999, DOI: 10.1103/PhysRevB.60.6230
Abstract: An effective Hamiltonian is constructed for an insulating cuprate with edge-sharing chains Li2CuO2.The Hamiltonian contains the nearest and next-nearest neighboring intrachain and zigzag-type interchain interactions.The values of the interactions are obtained from the analysis of the magnetic susceptibility, and this system is found to be described as coupled frustrated chains.We calculate the dynamical spin correlation function S(q,\omega) by using the exact diagonalization method, and show that the spectra of S(q,\omega) are characterized by the zigzag-type interchain interactions. The results of the recent inelastic neutron scattering experiment are discussed in the light of the calculated spectra.
Spectral variability of Ultra Luminous Compact X-ray Sources in Nearby Spiral Galaxies
T. Mizuno,A. Kubota,K. Makishima
Physics , 2001, DOI: 10.1086/321418
Abstract: Using the X-ray data taken with ASCA, a detailed analysis was made of intensity and spectral variations of three ultra-luminous extra-galactic compact X-ray sources (ULXs); IC 342 source 1, M81 X-6, and NGC 1313 source B, all exhibiting X-ray luminosity in the range 10^{39}-1.5x10^{40} erg s^{-1}. As already reported, IC 342 source 1 showed short-term X-ray intensity variability by a factor of 2.0 on a typical time scale of 10 ks. M81 X-6 varied by a factor of 1.6 across seven observations spanning 3 years, while NGC 1313 source B varied by a factor of 2.5 between two observations conducted in 1993 July and 1995 November. The ASCA spectra of these sources, acquired on these occasions, were all described successfully as optically-thick emission from standard accretion disks around black holes. This confirms previous ASCA works which explained ULXs as mass-accreting massive black-hole binaries. In all three sources, the disk color temperature was uncomfortably high at T_{in}=1.0-2.0 keV, and was found to vary in proportion to the square-root of the source flux. The apparent accretion-disk radius is hence inferred to change as inversely proportional to T_{in}. This suggests a significant effect of advection in the accretion disk. However, even taking this effect fully into account, the too high values of T_{in} of ULXs cannot be explained. Further invoking the rapid black-hole rotation may give a solution to this issue.
Effect of Obesity on Clinical and Financial Outcome in Patients Undergoing Liver Transplantation
S. Fujita,T. Fujikawa,S. Mizuno,T. Matsumoto
Transplantationsmedizin , 2007,
Abstract: Aim/Background: Liver transplantation may not be offered to some individuals at transplant programs because previous reports suggest that obese recipients have poorer outcomes. We assessed the influence of body mass index (BMI) on the outcome of liver transplantation in our liver transplant program. Material/Methods: Patients receiving a liver transplant between 1990 and 2005 were divided according to BMI: group 1, BMI <25 kg/m2; group 2, BMI 3 25 and < 30; group 3, BMI 3 30 and <35; and group 4, BMI 3 35. The impact of BMI on graft survival, patient survival, postoperative complications, length of hospital stay, and overall costs were retrospectively investigated. Results: BMI ranged from 15-42 (mean=26.7). Distribution into the groups was as follows: group 1, n=288 (41.1%); group 2, n=246 (35.1%); group 3, n=129 (18.4%); and group 4, n=37 (5.3%). We could not detect an effect of BMI on patient or graft survival, the incidence of acute graft rejection, or postoperative complications including cardiovascular complications. BMI was not related to length of hospital stay. There were no statistical differences between the three groups with respect to overall hospital cost in a generalized linear model, corrected for age, gender, calculated MELD score, re-transplant status, or return to the operating room. Conclusions: Obesity did not influence either the costs or the clinical outcome following liver transplantation in our patient population.
Loosening and Sliding Behaviour of Bolt-Nut Fastener under Transverse Loading
Hattori T.,Yamashita M.,Mizuno H.,Naruse T.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100608002
Abstract: The thread joint has been frequently used for the efficient productivity and maintainability as a machine element. However, many troubles such as loosening of bolted joints or fatigue failure of bolt were often experienced. Many attentions must be paid on the improvement of the strength and the reliability of the thread joints [1, 2]. It is generally said that the fastening axial force rapidly decreases by the rotation loosening of nuts if the relative slippage on the interfaces between nuts and fastened body goes beyond a certain critical limit [3]. This critical relative slippage (Scr) that prescribes the upper limit for preventing the loosening behaviour has been estimated according to the theoretically obtained equation considering the bending deformation of bolt and the geometrical constraint condition. In this paper, firstly we present the equation for estimating the Scr based on the fundamental cantilever deformation model. Then we present the investigated results of the deformation behaviour of bolt-nut joint under transverse loading condition considering the reaction moment by nut (Mn). Finaly we can confirmed that these estimated results of critical relative slippage coincided well with the experimental results [4, 5].
Instantaneous Measurement of Velocity Fields in Developed Thermal Turbulence in Mercury
T. Mashiko,Y. Tsuji,T. Mizuno,M. Sano
Physics , 2003, DOI: 10.1103/PhysRevE.69.036306
Abstract: Using ultrasonic velocimetry we measured the vertical profile of the velocity fluctuation in high Rayleigh number thermal convection in a cell with aspect ratio of 0.5, filled with a low Prandtl number fluid, mercury. Intriguing fluctuating dynamics of the mean flow and universal nature of the kinetic energy cascade are elucidated utilizing spectral decomposition and reconstruction. Scaling properties of the structure functions and the energy spectrum are directly calculated without the use of Taylor's frozen-flow hypothesis for the first time. Despite the complex nature of the mean flow, it is found that the energy cascade process exhibits universal laws in thermal turbulence.
Up-Regulation of Local TGF-β Contributes to a Decrease in Renal Tubular Na+-K+ ATPase and Hyperkalemia in a Mouse Model of Crush Syndrome  [PDF]
Shinya Mizuno, Yoko Mizuno-Horikawa
Pharmacology & Pharmacy (PP) , 2016, DOI: 10.4236/pp.2016.712054
Abstract: Hyperkalemia is one of the most important risk factors in patients suffering from crush syndrome with rhabdomyolysis. Glycerol-injected animals have been used as an experimental model of rhabdomyolysis-induced acute kidney injury (AKI), but little information is available for the onset and molecular mechanism of hyperkalemia. In our murine model, plasma potassium levels increased after a single injection of 50%-glycerol solution (10 ml/kg, i.m.) during the progression of muscular and renal injuries. Renal tubular Na+-K+-ATPase functions as ion-exchange pomp for potassium clearance from blood into renal tubular epithelial cells. Renal histochemistry revealed an apparent decrease in the tubular Na+-K+-ATPase expression, especially at 24 hours post-glycerol challenge in our AKI model. In contrast to the loss in active Na+-K+-ATPase, there was a significant increase in the renal levels of transforming growth factor-β (TGF-β) that is known to suppress Na+-K+-ATPase production in vitro. When anti-TGF-β antibody was administered in mice after the glycerol challenge, the suppression of renal Na+-K+-ATPase activity was partially restored. As a result, hyperkalemia was improved in the TGF-β-neutralized AKI mice, associated with a significant decrease in plasma potassium concentration. Taken together, we predict that endogenous TGF-β is a key regulator for inhibiting Na+-K+-ATPase production and, in part, enhancing hyperkalemia during progression of rhabdomyolysis-induced AKI. This is, to our knowledge, the first report to determine a critical role of endogenous TGF-β in renal potassium metabolism during crush syndrome.
Ground-based millimeter-wave observation of stratospheric ClO over Atacama, Chile in the mid-latitude Southern Hemisphere
T. Kuwahara, T. Nagahama, H. Maezawa, Y. Kojima, H. Yamamoto, T. Okuda, N. Mizuno, H. Nakane, Y. Fukui,A. Mizuno
Atmospheric Measurement Techniques (AMT) & Discussions (AMTD) , 2012,
Abstract: We have performed ground-based measurements of stratospheric chlorine monoxide (ClO) during the summer in 2009 over the Atacama highland, Chile, a new observing site in the mid-latitude region in the Southern Hemisphere, by using a millimeter-wave spectroscopic radiometer. The radiometer, equipped with a superconducting receiver and a digital Fourier spectrometer, was developed by Nagoya University, and the new observing system provides us high sensitivity and stable performance to measure the very weak ClO lines. The receiver noise temperature of the superconducting receiver is 170 K in DSB. To reveal the diurnal variation of ClO, we retrieved the vertical mixing ratio profiles by the weighted-damped least-squares algorithm applied for the spectral data at 203 GHz obtained between 5 and 16 December 2009. The total error on the retrieval is estimated to be 20% to 30% in an altitude range from 40 km to 50 km. The amplitude of the diurnal variation is estimated as 33% of the daytime average at 40 km. The observed time variation shows a pattern similar to that of the previous works observed in the northern mid-latitude region.
The Second Survey of the Molecular Clouds in the Large Magellanic Cloud by NANTEN. II. Star Formation
A. Kawamura,Y. Mizuno,T. Minamidani,M. D. Fillipovic,L. Staveley-Smith,S. Kim,N. Mizuno,T. Onishi,A. Mizuno,Y. Fukui
Physics , 2009, DOI: 10.1088/0067-0049/184/1/1
Abstract: We studied star formation activities in the molecular clouds in the Large Magellanic Cloud. We have utilized the second catalog of 272 molecular clouds obtained by NANTEN to compare the cloud distribution with signatures of massive star formation including stellar clusters, and optical and radio HII regions. We find that the molecular clouds are classified into three types according to the activities of massive star formation; Type I shows no signature of massive star formation, Type II is associated with relatively small HII region(s) and Type III with both HII region(s) and young stellar cluster(s). The radio continuum sources were used to confirm that Type I GMCs do not host optically hidden HII regions. These signatures of massive star formation show a good spatial correlation with the molecular clouds in a sense they are located within ~100 pc of the molecular clouds. Among possible ideas to explain the GMC Types, we favor that the Types indicate an evolutionary sequence; i.e., the youngest phase is Type I, followed by Type II and the last phase is Type III, where the most active star formation takes place leading to cloud dispersal. The number of the three types of GMCs should be proportional to the time scale of each evolutionary stage if a steady state of massive star and cluster formation is a good approximation. By adopting the time scale of the youngest stellar clusters, 10 Myrs, we roughly estimate the timescales of Types I, II and III to be 6 Myrs, 13 Myrs and 7 Myrs, respectively, corresponding to a lifetime of 20-30 Myrs for the GMCs with a mass above the completeness limit, 5 x 10^4 Msun.
Study of blind thrust faults underlying Tokyo and Osaka urban areas using a combination of high-resolution seismic reflection profiling and continuous coring
Y. Sugiyama,K. Mizuno,F. Nanayama,T. Sugai
Annals of Geophysics , 2003, DOI: 10.4401/ag-3446
Abstract: We acquired high-resolution seismic reflection profiles and continuously cored boreholes to evaluate active flexures produced by major blind thrust fault systems within two densely populated Neogene-Quaternary sedimentary basins in Japan: the Fukaya Fault System near Tokyo in the Kanto Basin and the Uemachi Fault System in the Osaka Basin. The high-resolution seismic reflection survey made clear the length, geometry and growth history of fault-related folds, or flexures formed above the two blind thrusts. Continuously cored boreholes linked with high-resolution seismic profiles enabled us to estimate the uplift rate as defined by shallow stratigraphic horizons and constrain the age of the most recent growth of the flexures during earthquakes on the Fukaya and Uemachi fault systems. Even with the high quality of the data we collected, it is still not possible to exactly constrain the age of the most recent blind thrust earthquake recorded by flexure of these fault-related folds. Data presented in this paper form the basis for future efforts aimed at mechanical and kinematic models for fault growth to evaluate the activity of blind thrusts underlying urban areas.
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